Find the center of mass of a thin plate of constant density covering the given region.The region between the x-axis and the curve y = 4csc2 x, 
? x ? 
A. 
= 
, 
= 6
B. 
= 
, 
= 4
C. 
= 
, 
= 
D. 
= 
, 
= 
Answer: C
Mathematics
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Solve the problem.Scores on a test are approximately normally distributed with a mean of 70 and a standard deviation of 9. The teacher wants to give A's to the top 10% of students. What is the bottom cutoff for an A grade? Round your answer to the nearest whole number.
A. 80 B. 90 C. 79 D. 82
Mathematics
Write the quotient in the standard form.
A. 
- 
i
B. 
+ 
i
C. 
+ 
i
D. 
- 
i
Mathematics
Find the area of the polygon.
A. 16 in2 B. 8 in2 C. 6 in2 D. 4 in2
Mathematics
Find the general form of the equation of the the circle.Center at the point (2, -3); containing the point (5, -3)
A. x2 + y2 + 4x - 6y + 4 = 0 B. x2 + y2 - 4x + 6y + 22 = 0 C. x2 + y2 - 4x + 6y + 4 = 0 D. x2 + y2 + 4x - 6y + 22 = 0
Mathematics